Optical recording medium
AssigneePioneer Electronic Corporation
InventorsTakashi Chuman, Takashi Yamada, Shingo Iwasaki, Toshiyuki Miyadera
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Abstract
An optical recording medium which has a recording medium and a light reflective film on a substrate. A top coat film made of organic material for adjusting reflectivity is formed on a surface of the substrate opposite to the other surface on which the at least one of the recording film and the light reflective film is formed. A reflectivity is remarkably enhanced without any adverse affect to a tracking error and an error rate. Also, it is easy to form the top coat. The top coat has an excellent weatherproof property.
Claims7
An optical recording medium comprising:
- a substrate;
- a recording film and a light reflective film formed on said substrate;
- and a top coat film made of organic material for adjusting reflectivity formed on a surface of the substrate opposite to another surface of said substrate on which at least one of said recording film and said light reflective film is formed,
- said top coat film having a thickness t that satisfies ##EQU1## wherein:
- n.sub.0 =refractive index of said top coat film;
- n.sub.1 =refractive index of said substrate;
- m=an odd integer;
- and
- .lambda.=wave length of light.
An optical recording medium comprising:
- a substrate;
- a recording film formed on a surface of said substrate;
- and a top coat film made of organic material for adjusting reflectivity formed on a surface of the substrate opposite to said surface of said substrate on which said recording film is formed, said top coat film having a thickness t that satisfies ##EQU2## wherein:
- n.sub.0 =refractive index of said top coat film;
- n.sub.1 =refractive index of said substrate;
- m=an odd integer;
- and
- .lambda.=wave length of light.
An optical recording medium comprising:
- a substrate;
- a light reflective film formed on a surface of said substrate;
- and a top coat film made of organic material for adjusting reflectivity formed on a surface of the substrate opposite to said surface of said substrate on which said light reflective film is formed, said top coat film having a thickness t that satisfies ##EQU3## wherein:
- n.sub.0 =refractive index of said top coat film;
- n.sub.1 =refractive index of said substrate;
- m=an odd integer;
- and
- .lambda.=wave length of light.
Dependencies are inferred from the claim text.